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F3 hv breakdown

What do i need to fix this problem

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You would need a clamp on amp meter and some basic electrical know how because you are dealing with a serious amount of power to seriously hurt or kill. You could try just looking at the hv transformers. sometimes you can see a burn mark which lets you know to change it, also check the fuses the third one (20 amp) is usually blown in this case

Posted on Nov 13, 2009

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2 Answers

F3 Mag Low Current


did you check transformers. also k1 , k2, k3, relays. also make sure all wires are put back right and the diodes are going in the right direction.

Mar 29, 2014 | TurboChef TORNADO Electric Oven

1 Answer

F3 mag curr


F3 MAG CURR means you have a problem with the high voltage system in your oven, the microwave circuit.

The next part is extremely dangerous, if you have no background in electric STAY OUT. CALL A PRO you will be working with 5000 volts.

With that said you will need a clamp on ampmeter to measure the current to narrow down the problem.

Discharging can be done by unplugging the oven and then short across the red wire on each capacitor to the chassis with an insulated screwdriver.
1. Remove the top and right side covers.
2. Enter the test mode. (From the OVEN OFF mode, simultaneously press
BACK and ENTER keys, enter the code 9-4-2-8 and press ENTER).
3. Place amp meter on the brown "ct" wire for amp reading. Wire is coming from the primary side of the
HV transformers and looping through the black plastic current transformer on the main control board and back to the HV transformers.
4. Press and hold the MGTRON soft key on the keypad to energize the magnetrons.
5. Observe the amperage on the meter. Typical readings are:
NORTH AMERICA: 12-14 amps at 240VAC/13-16 amps at 208VAC.
If you are getting 12-16 amps then change the I/O board.

If you are only getting 7 or 8 amps then only one side of the of the HV system is not working correctly. You will need to figure out which side is bad by un-plugging the power wires going to one of the HV transformers. Then test again and if you get no amps you have found the bad side. Replace the HV transformer, cap and diode.

If you are not getting any amps then check the F3 fuse it will most likely be blown. Replace and start over"

Mar 09, 2013 | TurboChef TORNADO Electric Oven

1 Answer

F 3 mag error. had a bad magnetron and hv transformer. went head and changed both hv transformers,diodes,caps,magnetrons. worked for about 5 hours and its back to blowing f3 fuse. Any ideas


F3 errors can indicate a mag problem. Did you replace both mags? It can also be a door switch. If your fuses are good, you need to inspect the 2 magnetrons. If you have a burned tip on one the waveguide and waveguide cover it will need to be replaced.

Feb 05, 2011 | TurboChef TORNADO Electric Oven

1 Answer

Changed out multiple parts but still get F3 MAG CURR error. Any Idea how to fix


You Didn't say which parts you have replaced so i have nothing to go on.

But we will begin from the start. F3 MAG CURR means you have a problem with the high voltage system in your oven, the microwave circuit.

The next part is extremely dangerous, if you have no background in electric STAY OUT. CALL A PRO you will be working with 5000 volts.

With that said you will need a clamp on ampmeter to measure the current to narrow down the problem.


Discharging can be done by unplugging the oven and then short across the red wire on each capacitor to the chassis with an insulated screwdriver.

1. Remove the top and right side covers.

2. Enter the test mode. (From the OVEN OFF mode, simultaneously press

BACK and ENTER keys, enter the code 9-4-2-8 and press ENTER).

3. Place amp meter on the brown "ct" wire for amp reading. Wire is coming from the primary side of the

HV transformers and looping through the black plastic current transformer on the main control board and back to the HV transformers.

4. Press and hold the MGTRON soft key on the keypad to energize the magnetrons.

5. Observe the amperage on the meter. Typical readings are:

NORTH AMERICA: 12-14 amps at 240VAC/13-16 amps at 208VAC.
If you are getting 12-16 amps then change the I/O board.

If you are only getting 7 or 8 amps then only one side of the of the HV system is not working correctly. You will need to figure out which side is bad by un-plugging the power wires going to one of the HV transformers. Then test again and if you get no amps you have found the bad side. Replace the HV transformer, cap and diode.

If you are not getting any amps then check the F3 fuse it will most likely be blown. Replace and start over

Good Luck If you have anymore questions just ask.

Nov 12, 2010 | TurboChef TORNADO Electric Oven

1 Answer

I have a f3 mag current error is coming.... and it is not heationg the sub enough...


F3 MAG CURR means you have a problem with the high voltage system in your oven, the microwave circuit.

The next part is extremely dangerous, if you have no background in electric STAY OUT. CALL A PRO you will be working with 5000 volts.

With that said you will need a clamp on ampmeter to measure the current to narrow down the problem.

Discharging can be done by unplugging the oven and then short across the red wire on each capacitor to the chassis with an insulated screwdriver.
1. Remove the top and right side covers.
2. Enter the test mode. (From the OVEN OFF mode, simultaneously press
BACK and ENTER keys, enter the code 9-4-2-8 and press ENTER).
3. Place amp meter on the brown "ct" wire for amp reading. Wire is coming from the primary side of the
HV transformers and looping through the black plastic current transformer on the main control board and back to the HV transformers.
4. Press and hold the MGTRON soft key on the keypad to energize the magnetrons.
5. Observe the amperage on the meter. Typical readings are:
NORTH AMERICA: 12-14 amps at 240VAC/13-16 amps at 208VAC.
If you are getting 12-16 amps then change the I/O board.

If you are only getting 7 or 8 amps then only one side of the of the HV system is not working correctly. You will need to figure out which side is bad by un-plugging the power wires going to one of the HV transformers. Then test again and if you get no amps you have found the bad side. Replace the HV transformer, cap and diode.

If you are not getting any amps then check the F3 fuse it will most likely be blown. Replace and start over

Nov 08, 2010 | TurboChef TORNADO Electric Oven

1 Answer

F3 code I have replaced 2 high voltage transformers,2 caps,2 mags,2 lo voltage transformers, 3 relays, and I/O board. and still have a F3, i have reprogramed the I/O board twice and my amp clamp reads 15.1...


holy **** that was a very expencive fix huh. I hope you spent the 50 bucks and have a service manual. What about the diodes, have you tested or changed those. That looks like the last thing i would change and there only a few bucks so i would change them at this point anyway. Are you blowing a fuse at all.
You need to narrow the problem down, not just toss money into the toilet replacing good parts. If your reading 15.1 amps then you have no problem in the high voltage system. Unless the amps are ramping or erratic. Your I/O board is bad if its reading 15.1 and triggering an f-3 fault. You said you replaced it though. Contact who you purchased it from and see if they will help. Its a $420 board and $160 for each HV Transformer they should help. I would guess that your I/O board it bad. You also said you changed relays. Did you change the K2 relay.
Hope you can solve the problem quick. Hopefully this helps

Nov 03, 2010 | TurboChef TORNADO Electric Oven

2 Answers

Getting f3 mag current reading


f 3 means blown fuse , which is located on the right side of the unit at the bottom , third one accross, once you have tested the fuse and found it to be faulty, before replacing it , you have to find out why it has failed, there are several reasons why this has happen , 1/ if primary and secondary interlocking door microswitches on left side panel open before monitor door switch on the other side ,it will put a short accross L1 AND L2 blowing F3 fuse , 2/ CHECK high voltage transformers to see if there are signs of burning on either primary or secondary windings, if you are not a tech or a electrician it is very hard to explain how to test to the other componets, capacitor doide or magnetron visual inspections is all you can do

Mar 11, 2010 | TurboChef C3 Single Oven

2 Answers

Onen display shows f3


The F3 error code relates to the oven temperature sensor and usually means this has failed and needs to be replaced.

It is a reasonably straightforward job, details of which you can find here; www.fixitnow.com/2003/02/appliance-tip-of-the-day-oven-temperature.htm

Jan 18, 2010 | Ovens

2 Answers

F3 FUSE BLOWING. DURING MAG AMPERAGE TEST 17.25 AMPS DOESNT BLOW FUSE AFTER 15 TO 20 SECONDS OF MAG TEST MODE. BLOWS 10 SECONDS AFTER STARTING TRUE COOK CYCLE. 208 VOLT OVEN. STEST SHOWS ALL ITEMS...


so you seem to know alot or enough to get by on this oven and you have the testing equipment clearly since you gave me the amp reading.

17.25 is just a little to high. Which is prolly why your having a hard time figuring out the problem. The next thing i would check would be the HV transformers. One of them is prolly pulling just to much. They should be somewhat even.

Discharge the HV Cap before continuing
Unplug the wire coming from the first cap to the transformer at the transformer and then energize the mag current record your amps

then plug that one back in and repeat for the other cap and HV transformer

hopefully you will notice a big difference in the amps between the two transformers

if that didn't work you will need to measure the windings of each transformer of which turbochef will give you this info

Also if the oven is working in test mode but not in a true cycle. Run it in a true cycle. Clamp your meter on then power up the oven and run the cycle that blows the fuse. See if the amps spike before the fuse blows

These fuses are expensive, too expensive to be blowing testing the oven. Bring the fuse to home depot and buy a bunch from them. There not an exact match, they will be a little short but will work for testing purposes. Once fixed buy the proper fuse from turbochef there around 10 bucks each

Good luck and don’t get down that you replaced those parts and its still not working. Most repair company’s replace all those parts anyway. Your typical bill to fix this problem is around 1800.

Oct 22, 2009 | TurboChef C3 Single Oven

1 Answer

F3 F3 F3


F3 code means "The oven temperature sensor is open". Check for open wire connection between EOC (Electronic Oven Control - Clock) and the oven temperature sensor. Replace sensor if no wiring problem.
If your not sure how to do this, I recommend calling a professional to get it fixed.

Hope that helps! Should you have any further questions, please feel free to post them here.

P.S. - If you find that the solution/answer I provided led you to, or resulted in a fix, please close the ticket with a FixYa! rating. I would be very grateful for your show of appreciation.

Thank you for using FIXYA!

Cheers!
IrishDruid

Oct 08, 2008 | Frigidaire 30" Self-Cleaning Freestanding...

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